What forces must be considered in non-inertial rotating reference frames?

[ergonomics]

dealing with non-inertial rotating reference frames, real forces such as the centripetal force need to be taken into account,or only the forces that can be really observed within the frame?

because from the perspective of the rotating frame, objects should be at rest. it only appears logical to replace the centripetal force with the centrifugal force when dealing in rotating frames.

 

[Doc Al]

Real forces always count. "Real" forces have agents as opposed to "fictitious" inertial forces that are artifacts of using a noninertial frame of reference.

Note: "centripetal" force just means a force that acts toward the center (or the net force acting toward the center)--it's not a separate kind of force.

Example: Imagine a spinning turntable on which a small block sits. The block spins along with the turntable. From an inertial frame, the block is centripetally accelerated; the centripetal force is the friction between turntable and block.

From the rotating frame that very real friction force still acts, but now the acceleration is zero: In addition to the real friction force, one needs to add the "fictitious" centrifugal force in order to use Newton's laws.

 

[charng]

I would like to clarify that both the centripetal force and the centrifugal force need to be taken into account when dealing with non-inertial rotating reference frames. In such frames, objects appear to be at rest but are actually experiencing a centripetal force that keeps them in circular motion. This centripetal force is a real force and must be considered in any analysis of the system. The centrifugal force, on the other hand, is a fictitious force that arises due to the inertia of the object in motion. It is a result of the frame of reference and does not actually act on the object. Therefore, while the centrifugal force may seem logical to replace the centripetal force in a rotating frame, it is important to understand that both forces play a role in the dynamics of the system. Only considering the forces that can be observed within the frame may lead to incorrect conclusions and inaccurate predictions. It is essential to take into account all real forces, including the centripetal force, in order to fully understand and accurately analyze systems in non-inertial rotating reference frames.